/*
  jsmin.js - 2010-03-31
  Author: Nick Galbreath
  Add minimal rhino wrapper, and de-tabified
  java -jar js.jar jsmin.js INFILE
  Permission is hereby granted to use the Javascript version under the same
  conditions as the jsmin.js on which it is based.

  jsmin.js - 2009-11-05
  http://fmarcia.info/jsmin/fulljsmin1.js

  Author: Billy Hoffman
  This is a patched version of jsmin.js created by Franck Marcia which
  supports important comments denoted with /*! ...
  Permission is hereby granted to use the Javascript version under the same
  conditions as the jsmin.js on which it is based.

  jsmin.js - 2006-08-31
  Author: Franck Marcia
  This work is an adaptation of jsminc.c published by Douglas Crockford.
  Permission is hereby granted to use the Javascript version under the same
  conditions as the jsmin.c on which it is based.

  jsmin.c
  2006-05-04

  Copyright (c) 2002 Douglas Crockford  (www.crockford.com)

  Permission is hereby granted, free of charge, to any person obtaining a copy of
  this software and associated documentation files (the "Software"), to deal in
  the Software without restriction, including without limitation the rights to
  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  of the Software, and to permit persons to whom the Software is furnished to do
  so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  The Software shall be used for Good, not Evil.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.

  Update:
  add level:
  1: minimal, keep linefeeds if single
  2: normal, the standard algorithm
  3: agressive, remove any linefeed and doesn't take care of potential
  missing semicolons (can be regressive)
  store stats
  jsmin.oldSize
  jsmin.newSize
*/

String.prototype.has = function(c) {
    return this.indexOf(c) > -1;
};

function jsmin(comment, input, level) {

    if (input === undefined) {
        input = comment;
        comment = '';
        level = 2;
    } else if (level === undefined || level < 1 || level > 3) {
        level = 2;
    }

    if (comment.length > 0) {
        comment += '\n';
    }

    var a = '',
    b = '',
    EOF = -1,
    LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz',
    DIGITS = '0123456789',
    ALNUM = LETTERS + DIGITS + '_$\\',
    theLookahead = EOF;


    /* isAlphanum -- return true if the character is a letter, digit, underscore,
       dollar sign, or non-ASCII character.
    */

    function isAlphanum(c) {
        return c != EOF && (ALNUM.has(c) || c.charCodeAt(0) > 126);
    }


    /* get -- return the next character. Watch out for lookahead. If the
       character is a control character, translate it to a space or
       linefeed.
    */

    function get() {

        var c = theLookahead;
        if (get.i == get.l) {
            return EOF;
        }
        theLookahead = EOF;
        if (c == EOF) {
            c = input.charAt(get.i);
            ++get.i;
        }
        if (c >= ' ' || c == '\n') {
            return c;
        }
        if (c == '\r') {
            return '\n';
        }
        return ' ';
    }

    get.i = 0;
    get.l = input.length;


    /* peek -- get the next character without getting it.
     */

    function peek() {
        theLookahead = get();
        return theLookahead;
    }


    /* next -- get the next character, excluding comments. peek() is used to see
       if a '/' is followed by a '/' or '*'.
    */

    function next() {

        var c = get();
        if (c == '/') {
            switch (peek()) {
            case '/':
                for (;;) {
                    c = get();
                    if (c <= '\n') {
                        return c;
                    }
                }
                break;
            case '*':
                //this is a comment. What kind?
                get();
                if(peek() == '!') {
                    //important comment
                    var d = '/*!';
                    for (;;) {
                        c = get();
                        switch (c) {
                        case '*':
                            if (peek() == '/') {
                                get();
                                return d+'*/';
                            }
                            break;
                        case EOF:
                            throw 'Error: Unterminated comment.';
                        default:
                            //modern JS engines handle string concats much better than the
                            //array+push+join hack.
                            d+=c;
                        }
                    }
                } else {
                    //unimportant comment
                    for (;;) {
                        switch (get()) {
                        case '*':
                            if (peek() == '/') {
                                get();
                                return ' ';
                            }
                            break;
                        case EOF:
                            throw 'Error: Unterminated comment.';
                        }
                    }
                }
                break;
            default:
                return c;
            }
        }
        return c;
    }


    /* action -- do something! What you do is determined by the argument:
       1   Output A. Copy B to A. Get the next B.
       2   Copy B to A. Get the next B. (Delete A).
       3   Get the next B. (Delete B).
       action treats a string as a single character. Wow!
       action recognizes a regular expression if it is preceded by ( or , or =.
    */

    function action(d) {

        var r = [];

        if (d == 1) {
            r.push(a);
        }

        if (d < 3) {
            a = b;
            if (a == '\'' || a == '"') {
                for (;;) {
                    r.push(a);
                    a = get();
                    if (a == b) {
                        break;
                    }
                    if (a <= '\n') {
                        throw 'Error: unterminated string literal: ' + a;
                    }
                    if (a == '\\') {
                        r.push(a);
                        a = get();
                    }
                }
            }
        }

        b = next();

        if (b == '/' && '(,=:[!&|'.has(a)) {
            r.push(a);
            r.push(b);
            for (;;) {
                a = get();
                if (a == '/') {
                    break;
                } else if (a =='\\') {
                    r.push(a);
                    a = get();
                } else if (a <= '\n') {
                    throw 'Error: unterminated Regular Expression literal';
                }
                r.push(a);
            }
            b = next();
        }

        return r.join('');
    }


    /* m -- Copy the input to the output, deleting the characters which are
       insignificant to JavaScript. Comments will be removed. Tabs will be
       replaced with spaces. Carriage returns will be replaced with
       linefeeds.
       Most spaces and linefeeds will be removed.
    */

    function m() {

        var r = [];
        a = '\n';

        r.push(action(3));

        while (a != EOF) {
            switch (a) {
            case ' ':
                if (isAlphanum(b)) {
                    r.push(action(1));
                } else {
                    r.push(action(2));
                }
                break;
            case '\n':
                switch (b) {
                case '{':
                case '[':
                case '(':
                case '+':
                case '-':
                    r.push(action(1));
                    break;
                case ' ':
                    r.push(action(3));
                    break;
                default:
                    if (isAlphanum(b)) {
                        r.push(action(1));
                    } else {
                        if (level == 1 && b != '\n') {
                            r.push(action(1));
                        } else {
                            r.push(action(2));
                        }
                    }
                }
                break;
            default:
                switch (b) {
                case ' ':
                    if (isAlphanum(a)) {
                        r.push(action(1));
                        break;
                    }
                    r.push(action(3));
                    break;
                case '\n':
                    if (level == 1 && a != '\n') {
                        r.push(action(1));
                    } else {
                        switch (a) {
                        case '}':
                        case ']':
                        case ')':
                        case '+':
                        case '-':
                        case '"':
                        case '\'':
                            if (level == 3) {
                                r.push(action(3));
                            } else {
                                r.push(action(1));
                            }
                            break;
                        default:
                            if (isAlphanum(a)) {
                                r.push(action(1));
                            } else {
                                r.push(action(3));
                            }
                        }
                    }
                    break;
                default:
                    r.push(action(1));
                    break;
                }
            }
        }

        return r.join('');
    }

    jsmin.oldSize = input.length;
    ret = m(input);
    jsmin.newSize = ret.length;

    return comment + ret;
}

/**
 * Minimal Rhino Wrapper
 *
 */
(function (a) {
    var app = 'jsmin.js'
    var e, i, input;
    if (!a[0]) {
        print("Usage: " + app + " file.js");
        quit(1);
    }
    input = readFile(a[0]);
    if (!input) {
        print(app + ": Couldn't open file '" + a[0] + "'.");
        quit(1);
    }
    print(jsmin(input));
    quit(0);
}(arguments));